The simplest way to reset the PIN is to disconnect the mains, open the control unit cover (two screws) and disconnect one of the (push fit) wires from the battery. When the fault starts to happen on a regular basis, replace the alarm!. The short term cure is to follow the same sequence as the forgotten PIN code. The control panel stops responding completely. Maplin sell a suitable replacment battery for about 12.00. Note that this problem occurs when the mains supply is operating normally. This made them easy to trigger spuriously (such as by pressing any key). This occurred usually in the middle of the night, and it took some time to track down the cause as a failing rechargeable battery in the control unit, which was pulling the 12V supply to the PIRs down to about 7V. Changing the panel has always cured the problem.Д¬ommon problems with this alarm that we encountered before finally replacing it. Over the last 10 years, I must have replaced nearly 100 of these Omnicron panels, almost all have had the same random faults as you describe. The Omnicron unfortunataly is prone to suffer from all sorts of problems that most other control equipment can cope well with, not just static build up but Mains spikes and surges cause faults, EMF passed down through the alarm cabling can cause faults, close proximity to a strong transmitter, etc etc etc. You have done very well if youve had so few problems over the years, most Omnicrons start to play up over a much shorter time span. When your Omnicron starts to play up, its time to change it. So you from this you can see your not putting too much on the PSU. As with most domestic alarm panels the omnicron will provide 1 Amp at 13.8 volts.ДЄ typical bellbox with sab module will use around 30mA in standby, and around 350mA when sounding.ДЄn internal speaker or Siren might also use 30mA standby and 350mA sounding, so in an alarm condition this would leave around 300mA spare for powering detectors.ДЄ typical pir only uses between 10 and 20mA, so if we say 20mA per pir detector then in theory your panel will happily supply power for upto 15 pir detectors.

Omnicron alarm manual